Ender 3 Filament Runout Sensor
thingiverse
The Ender 3 Filament Runout Sensor is mounted conveniently below the spool, utilizing a roller microswitch for reliable detection. A leftover T-slot nut was repurposed to secure the sensor in place, while a tapered Allen screw found among spare parts from the original Enders package provided additional support and stability.
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